January 2008 - dovecot

[Dovecot] Capturing credentials for imap sync
by Master Abi 26 Jan '08

26 Jan '08

Hi List All the imap sync apps I could find requires the username /password credentails to be known before a sync occurs. I have Dovecot using ldap acting as a nearline backup mail server to MS Exchange. Every hour imapsync syncs mail between Exchange and Dovecot. This all works fine becuase the users credentials are known, but when new users are added I would like the process to work seemless like this: The user is added to the Active Directory. The mail client is configured with 2 accounts with identical credentials, one of which is connected to Dovecot. When the new client connects to dovecot, the credentials are captured and stored so that imapsync can use it. This If there is another way this can be done with dovecot, could I please be enlighten. I have read the doco on migration but I am not quite migrating but more replicating. Thank you

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[Dovecot] symbolic links to root node
by Martin Preen 25 Jan '08

25 Jan '08

Hello, I have a question about the way Dovecot limits file system access. Currently we're using Dovecot 1.0.5 (Solaris 10). In some cases users have a symbolic link like "z: -> /" in their mail directory. As a result there are log entries like Jan 25 13:30:31 imap1 dovecot: [ID 107833 mail.error] IMAP(xyz): stat(/home/xyz/.wine/dosdevices/c:/windows/profiles/xyz/.../z:/proc/28381/root/proc/28381/.../root/proc/28381/Player/#SharedObje Jan 25 13:30:31 imap1 dovecot: [ID 107833 mail.error] IMAP(xyz): x) failed: File name too long We know the reason (the links are create by Wine) but unfortunately we cannot get rid of them. Is there something I can do (these links should be ignored) ? Or is it a bug ? Greetings. Martin --------------------------------------------------------------- Martin Preen, Universität Freiburg, Institut für Informatik Georges-Koehler-Allee 52, Raum 00-006, 79110 Freiburg, Germany phone: ++49 761 203-8250 preen(a)informatik.uni-freiburg.de fax: ++49 761 203-8242 www.informatik.uni-freiburg.de

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[Dovecot] New server error
by Anne Wilson 25 Jan '08

25 Jan '08

I'm setting up a replacement mail server on a CentOS 5.1 box. The dovecot version is 1.0.rc15. 'dovecot -n' returns # /etc/dovecot.conf login_dir: /var/run/dovecot/login login_executable(default): /usr/libexec/dovecot/imap-login login_executable(imap): /usr/libexec/dovecot/imap-login login_executable(pop3): /usr/libexec/dovecot/pop3-login mail_executable(default): /usr/libexec/dovecot/imap mail_executable(imap): /usr/libexec/dovecot/imap mail_executable(pop3): /usr/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/lib/dovecot/imap mail_plugin_dir(imap): /usr/lib/dovecot/imap mail_plugin_dir(pop3): /usr/lib/dovecot/pop3 auth default: passdb: driver: pam userdb: driver: passwd I can telnet localhost 143 and log in. I have given kmail the address of the server and an Inbox has been created, but no option to create sub-folders. If I attempt to send a message kmail freezes. Clearly something's wrong. I am using configuration files from the old server, modified only to the new server details. I have alias and transport hashes. What else should I be looking at? Thanks Anne

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[Dovecot] dovecot + antispam + sendmail
by Anil 25 Jan '08

25 Jan '08

Whats a good antispam solution? I am using sendmail and dovecot 1.1. I came across dovecot's antispam plugin, but it seems it does not support 1.1 yet. I am also looking for something non-perl based. I am already doing some greylisting with sendmail milter. Any other good suggestions? If not, I guess I might have to downgrade back to 1.0 dovecot. Thanks

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[Dovecot] Is there a way to limit multiple POP3 connections?
by patrickm 25 Jan '08

25 Jan '08

Hi all, Please correct me if I'm going about this the wrong way. We currently have a 3 system Mail server set up - two machines are the load balanced frontends running Dovecot and Postfix, and the third machine is our NFS. Over the past 4 months or so, I've tweaked and optimized our mail servers, and we receive roughly 3 million emails a day combined through this setup. Sometimes, the IO Wait is horrible on the load balanced servers - it can get up into the 80-90% range sometimes - it's usually when a lot of email is being passed, or there are a lot of POP3 and IMAP connections. One item which I believe to be hurting I/O performance is the fact I used a RAID 10 setup using SATA II drives on an LSI Logic SATA I controller, in 32 bit mode. Until we rebuild our mail setup (which may be another year down the road), I want to make sure these servers are optimized to the fullest just in case we get heavy I/O usage, it doesn't slow down if at all possible. One thing I noticed is that when issuing a 'ps aux | grep -i pop' or 'ps aux | grep -i imap' I see the same username 2,3,4,5 times, sometimes more. When issuing a 'tail -f /var/log/dovecot.log' I notice that some users log into POP3 every 3 seconds, sometimes sooner. Without upsetting the customer, is there anything I can do on my end to disallow people logging into POP3 multiple times at once? Any tips on this is very much appreciated. Thanks in advance. Patrick

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[Dovecot] sieve vacation
by Asbjørn Sannes 25 Jan '08

25 Jan '08

I think sieve vacation is cutting off the last line of the vacation message, is this a known problem? vacation addresses: "john(a)example.com" "not here now" Would return an empty message, changing it to: vacation addresses: "john(a)example.com" "not here now have a nice day" And it would send a message with only "not here now" in it, but not "have a nice day". For the record using: http://dovecot.org/releases/sieve/dovecot-sieve-1.0.2.tar.gz Mvh, Asbjørn Sannes

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[Dovecot] Dovecot + MySQL problem
by Timo Neuvonen 25 Jan '08

25 Jan '08

I recently upgraded my Fedora Core 6 (mail)server to Fedora 8. Unfortunately I don't any more have absolutely reliable information available on the Dovecot version that was the last one I had on FC6, but I guess it has been 1.0.3 (I found it from a FC6 repo right now). Currently, Fedora 8 has version 1.0.7 that comes as binary rpm from Fedora repos. So, the problem: I had set up an authentication system using mysql database. It worked fine as long as I were using FC6, but after upgrade Dovecot dies immediatedly after the system startup, writing this to log: Jan 24 16:14:46 test dovecot: Dovecot v1.0.7 starting up Jan 24 16:14:46 test dovecot: auth(default): Unknown database driver 'mysql' Jan 24 16:14:46 test dovecot: Auth process died too early - shutting down My first idea was that Dovecot is compiled without sql support. However: [root@test etc]# dovecot --build-options Build options: ioloop=poll notify=inotify ipv6 openssl SQL drivers: mysql postgresql sqlite Passdb: checkpassword ldap pam passwd passwd-file shadow sql Userdb: checkpassword ldap passwd prefetch passwd-file sql static If I change "mysql" to "pgsql" in the following in the conf file, the error message will change accordingly: # Database driver: mysql, pgsql, sqlite #driver = driver = mysql I also have CentOS 5.1 system with Dovecot 1.0.rc15. I tried the database authentication with similar conf there, it did work. So, is there an essential (intentional) change in sql configuration between 1.0.rc15 (and obviously 1.0.3) to 1.0.7, or should I start finding the problem from incorrectly built binary of 1.0.7? Regards, Timo

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[Dovecot] dotlock errors without using dotlock
by Brian Taber 25 Jan '08

25 Jan '08

I have a few clients that have more than one user in the same mailbox. I have my setup using fctrl for mailbox and index locking. My mail is stored on a network file system (gluster) and my indexes are stored on the local drive. I have a few issues: - My users mailboxes have issues where messages will be mixed up (you go to open a message and it gets a different message) - messages will dissappear - unable to open or delete messages - errors in log about dotlocks being overwritten Here is some of the log entries: Our dotlock file /mail/mydomain.com/webmaster/dovecot-uidlist.lock was overridden (kept it 0 secs) utime(/mail/mydomain.com/webmaster/dovecot-uidlist.lock) failed: No such file or directory Transaction log file /mailindex/mydomain.com/webmaster/.INBOX/dovecot.index.log: marked corrupted Our dotlock file /mail/mydomain.com/webmaster/dovecot-uidlist.lock was deleted (kept it 0 secs) FETCH for mailbox INBOX UID 4223 got too little data: 3078 vs 19825 My dovecot version is 1.0.9, my config is as follows: # 1.0.9: /etc/dovecot/dovecot.conf info_log_path: /dev/null protocols: imap imaps pop3 pop3s listen(default): *:143 listen(imap): *:143 listen(pop3): *:110 ssl_listen(default): *:943 ssl_listen(imap): *:943 ssl_listen(pop3): *:995 ssl_disable: yes ssl_cert_file: /etc/dovecot/ssl/certs/dovecot.pem ssl_key_file: /etc/dovecot/ssl/private/dovecot.pem disable_plaintext_auth: no login_dir: /usr/local/var/run/dovecot/login login_executable(default): /usr/local/libexec/dovecot/imap-login login_executable(imap): /usr/local/libexec/dovecot/imap-login login_executable(pop3): /usr/local/libexec/dovecot/pop3-login login_processes_count: 10 mail_location: maildir:/mail/%d/%Ln:INDEX=/mailindex/%d/%Ln mmap_disable: yes mbox_write_locks: fcntl mbox_dirty_syncs: no mail_executable(default): /usr/local/libexec/dovecot/imap mail_executable(imap): /usr/local/libexec/dovecot/imap mail_executable(pop3): /usr/local/libexec/dovecot/pop3 mail_plugin_dir(default): /usr/local/lib/dovecot/imap mail_plugin_dir(imap): /usr/local/lib/dovecot/imap mail_plugin_dir(pop3): /usr/local/lib/dovecot/pop3 pop3_uidl_format(default): pop3_uidl_format(imap): pop3_uidl_format(pop3): %u namespace: type: private separator: . inbox: yes namespace: type: private separator: . prefix: INBOX. inbox: yes hidden: yes auth default: cache_size: 2048 count: 5 passdb: driver: sql args: /etc/dovecot/dovecot-sql.conf userdb: driver: sql args: /etc/dovecot/dovecot-sql.conf Any help would be appreciated...

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[Dovecot] Out of memory [repost as a new thread]
by Wolfram Schlich 24 Jan '08

24 Jan '08

Hi, this happens since a few days on a Gentoo hardened system using a grsecurity enabled kernel running Dovecot 1.0.10, only to 2 of 10 users though: --8<-- kernel: grsec: From 192.168.0.1: denied resource overstep by \ requesting 537325568 for RLIMIT_AS against limit 536870912 \ for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \ gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \ uid/euid:0/0 gid/egid:0/0 kernel: grsec: From 192.168.0.1: denied resource overstep by \ requesting 537321472 for RLIMIT_AS against limit 536870912 \ for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \ gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \ uid/euid:0/0 gid/egid:0/0 kernel: grsec: From 192.168.0.1: denied resource overstep by \ requesting 537456640 for RLIMIT_AS against limit 536870912 \ for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \ gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \ uid/euid:0/0 gid/egid:0/0 kernel: grsec: From 192.168.0.1: denied resource overstep by \ requesting 537321472 for RLIMIT_AS against limit 536870912 \ for /usr/libexec/dovecot/imap[imap:15708] uid/euid:30010/30010 \ gid/egid:30006/30006, parent /usr/sbin/dovecot[dovecot:15574] \ uid/euid:0/0 gid/egid:0/0 dovecot: IMAP(info): block_alloc(): Out of memory dovecot: child 15708 (imap) returned error 83 (Out of memory) --8<-- grsecurity only logs the attempted resource overstep. I already increased mail_process_size to 512M and deleted the index.cache* files inside the users maildir -- didn't help :/ Any idea why this is happening or how I could find out? TIA :) -- Regards, Wolfram Schlich <wschlich(a)gentoo.org> Gentoo Linux * http://dev.gentoo.org/~wschlich/

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[Dovecot] Maildir format, "From " in the first line
by Sébastien Munch 24 Jan '08

24 Jan '08

Hello, Using Dovecot's deliver MDA, all mails are stored with the line "From <sender> <date>" appended. When forwarding these mails as attachements, the recipients get the source code. When Postfix delivers emails directly in the Maildirs, this first line is not appended, and there is no problem when forwarding the mails. Why is this line appended by deliver ? Is there a way to remove it ? Or is there something else I can do to avoid this forwarding problem. I'm using Dovecot 1.0.rc15 from Debian Etch. Regards -- Sébastien Munch - expert Linux et sécurité Société Adelux - http://www.adelux.fr Tél. 01 46 88 60 53 - Fax. 01 47 90 26 32 GPG. http://www.adelux.fr/societe/gpg/sebastien.asc

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